Thanks for that! A nice review of C. Tolkien's lifelong collaboration with his father. I had hoped you were going to reveal an unfinished opera libretto, but I'm not really surprised at its absence...

A few quibbles. C. Tolkien's undeniable achievements as a scholar do not, I think, rate the elevated praise of your "Christopher then went on to parallel his father’s professional success in academia." The phrasing would imply to a casual reader that C. Tolkien's academic career was of the same magnitude and impact on the field as his father's. That is simply not the case, as you surely know.

Secondly, C. Tolkien did not "create" the maps of Middle-earth, as your description and Diana Glyer's review seem to say. Rather, he re-drew his father's "working" map manuscripts, to make them presentable and then publishable. The quality of his draftsmanship and the style of his cartography are first-rate, and well deserve any reviewer's compliments about their contribution to a reader's enjoyment of J.R.R. Tolkien's stories. But as C. Tolkien makes perfectly clear in his HoME series, it was JRRT who drew all the maps originally - it was the author himself who created and first drew up (piece by piece) the geography of The Hobbit's Wilderland, The Silmarillion's Beleriand, and the most famous land of all, The Lord of the Rings' Middle-earth at the end of the Third Age.